EP0357085A1 - Déphaseur à guide d'ondes coaxial - Google Patents

Déphaseur à guide d'ondes coaxial Download PDF

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Publication number
EP0357085A1
EP0357085A1 EP89116207A EP89116207A EP0357085A1 EP 0357085 A1 EP0357085 A1 EP 0357085A1 EP 89116207 A EP89116207 A EP 89116207A EP 89116207 A EP89116207 A EP 89116207A EP 0357085 A1 EP0357085 A1 EP 0357085A1
Authority
EP
European Patent Office
Prior art keywords
coaxial
phase shifter
irises
conductor
waveguide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89116207A
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German (de)
English (en)
Other versions
EP0357085B1 (fr
Inventor
Giuseppe Figlia
Davide Forigo
Flavio Mercurio
Dario Savini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telecom Italia SpA
Original Assignee
CSELT Centro Studi e Laboratori Telecomunicazioni SpA
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Application filed by CSELT Centro Studi e Laboratori Telecomunicazioni SpA filed Critical CSELT Centro Studi e Laboratori Telecomunicazioni SpA
Publication of EP0357085A1 publication Critical patent/EP0357085A1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/18—Phase-shifters
    • H01P1/183—Coaxial phase-shifters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
    • H01P1/161—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion sustaining two independent orthogonal modes, e.g. orthomode transducer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/165—Auxiliary devices for rotating the plane of polarisation

Definitions

  • the present invention refers to devices for telecommunications systems operating at microwaves and more particularly it concerns a coaxial-waveguide phase shifter.
  • coaxial waveguides consist of a hollow cylindrical conductor, whereinto a second cylindrical conductor is inserted, which is also hollow and coaxial with the external conductor.
  • Said guides are used whenever mode TE11 propagation of signals belonging to two different frequency bands, even though very distant from each other, are desired.
  • the internal conductor acts as a conventional circular waveguide, wherein signals belonging to the higher frequency band propagate, whilst the region comprised between the external conductor and the internal one acts as a waveguide wherein signals belonging to the lower frequency band propagate.
  • the coaxial waveguide presents a pass band, meant as the band comprised between cutoff frequency of mode TE11 and the frequency of the first higher mode, which is wider than the band of the circular waveguide with the same diameter.
  • the addition of one or more external cylindrical conductors allows the addition of a corresponding numher of frequency bands propagating in the fundamental mode. A great number of information can thus be transmitted, which can be further doubled by using signals belonging to the same frequency band but with different polarizations.
  • phase shifter can he used to convert a circular polarization signal into a linear polarization signal, thus operating as a polarizer with a 90° phase shift, or for rotating the polarization of a linearly polarized signal, keeping the polarization linear: in this case phase shift introduced must be of 180°.
  • a polarizer with a 90° phase shift allows also the separation of circularly polarized signals with opposite rotation directions, supplying two linearly-polarized orthogonal signals, which can easily be separated.
  • phase shifters in rectangular or circular waveguide are already known in the literature.
  • a circular waveguide phase shifter has been described in the article entitled “Polarization diversity lowers antenna feed-line noise", by Howard C. Yates et alii, issued in Microwaves, May 1968. It consists of a circular waveguide section, whereinto cascaded irises are placed, composed of two equal circular segments in opposition. A total phase shift of 90 or 180 degrees is obtained by distributing it conveniently on the different irises, generally placed at a quarter-wave spacing at the design-center frequency. Bandwidths of an octave were obtained for 90° ⁇ 1° phase shifts.
  • phase shifter For applications on board a satellite light and reduced-­encumbrance devices are also required. Which entails the search for the optimum number of irises the phase shifter is implemented with, since also total length of the device depends on this number.
  • phase shifters designed for circular waveguide systems
  • the desired bandwidths were obtained by using a rather high number of irises; hence the structures obtained are cumbersome.
  • the coaxial-waveguide phase shifter provided by the present invention, which presents the above-mentioned performances, which is of small dimensions and can be designed rigorously through the exact synthesis of the equivalent electrical network.
  • the device is also apt to be used on board a satellite, since dielectric parts are not required which present a thermomechanical behaviour not easily predictable owing to expansions, ageing, soldering operations, etc.
  • the present invention provides a coaxial-waveguide phase shifter, characterized in that it consists of a coaxial waveguide section, comprising external and internal hollow cylindrical conductors, whereinbetween a certain number of irises parallel to each other is inserted.
  • the phase shifter consists of a coaxial guide section, comprising an external cylindrical conductor CE as well as an internal cylindrical conductor CI, both hollow.
  • the internal diameter of the external conductor and the external diameter of the internal conductor are D and d respectively.
  • N of irises I fixed to the external guide. They consist of two opposite plates having the shape of circular segments with rectilinear sides parallel to each other. Plate thickness is T, rectilinear sides are separated by a distance W and spacing between the irises is Li.
  • phase shifter depends on the above mechanical parameters, and more particularly on W/D, D/d, T of each iris and on Li and N, which must accurately be defined while designing it.
  • W/D, D/d, T of each iris and on Li and N which must accurately be defined while designing it.
  • design and optimization of rectangular or circular waveguide phase shifters have been chiefly experimentally carried out, following rather slow and expensive procedures.
  • the electrical models used were not apt to represent structures with irises very close to each other.
  • phase shifter for instance 90 or 180 degrees, frequency band F1-F2, at which the device is to operate, number N of irises to be inserted into the guide and the distribution of phase shifts ⁇ i allotted to each iris along the guide, e.g. a choice is possible between uniform, binomial, tapered distributions or the like, in function of the performances required as to return losses and bandwidth.
  • W/D and L values relating to the last iris can be obtained by using previously prepared design data.
  • quadripole equivalent of the cell composed of the guide section and of the iris is derived by expressing the reactances which form it in function of the mechanical characteristics of the iris itself.
  • the relations obtained allow the built up of curves of the phase shift ⁇ i introduced by the cell in function of W/D and T of the iris, where the frequency forms the parameter. Said curves can he then directly used or even better computer-memorised and used in the automated design phase.
  • the following step is that of implementing the phase shift ⁇ N-1 by combining in cascade the two cells, to obtain new values W/D and L relating to the last iris but one. Since in this case the load is no longer matched due to the last iris presence, it is necessary to calculate the phase shift of the single cell taking into account multiple reflections. Even in this case it is possible to build up the curves of the phase shift to be obtained in function of the phase shift of the isolated single cell where the reflection coefficient is the parameter.
  • the process goes on like this up to the obtention of all the iris data.
  • the device can also use irises with a different shape from that of two opposite circular segments, provided they do not present radial symmetry, since they have to yield a phase shift between incident signals with orthogonal polarizations.
  • Fig 3 shows different shapes of irises.
  • the iris denoted by a) consists of two sectors of an annulus and that denoted by b) of two rectangular plates.
  • dissymmetry is due to the same internal waveguide presenting a rectangular cross section, while in d) and e) the iris consists of plates having respectively the shapes of circular sector and rectangle, fixed to the internal circular waveguide.
  • the design requires the equivalent electrical circuit of the iris used.
EP89116207A 1988-09-02 1989-09-01 Déphaseur à guide d'ondes coaxial Expired - Lifetime EP0357085B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6778788 1988-09-02
IT8867787A IT1223796B (it) 1988-09-02 1988-09-02 Dispositivo sfasatore in guida d'onda coassiale

Publications (2)

Publication Number Publication Date
EP0357085A1 true EP0357085A1 (fr) 1990-03-07
EP0357085B1 EP0357085B1 (fr) 1994-08-17

Family

ID=11305290

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89116207A Expired - Lifetime EP0357085B1 (fr) 1988-09-02 1989-09-01 Déphaseur à guide d'ondes coaxial

Country Status (7)

Country Link
US (1) US4982171A (fr)
EP (1) EP0357085B1 (fr)
JP (1) JPH02113601A (fr)
AU (1) AU620637B2 (fr)
CA (1) CA1318370C (fr)
DE (2) DE357085T1 (fr)
IT (1) IT1223796B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995010862A1 (fr) * 1993-10-14 1995-04-20 Deltec New Zealand Limited Dephaseur differentiel variable
CN1051883C (zh) * 1996-11-28 2000-04-26 台扬科技股份有限公司 宽频、短长度的圆形波导移相器

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5459442A (en) * 1995-01-23 1995-10-17 Mcdonnell Douglas Corporation High power RF phase shifter
JP3657484B2 (ja) * 1999-12-10 2005-06-08 三菱電機株式会社 円偏波発生器
IT1319925B1 (it) * 2000-02-29 2003-11-12 Cselt Centro Studi Lab Telecom Polarizzazione in guida d'onda.
AU2001255481A1 (en) 2000-04-20 2001-11-07 Paratek Microwave, Inc. Waveguide-finline tunable phase shifter
US7656246B2 (en) * 2008-03-28 2010-02-02 Optim Microwave, Inc. Circular polarizer using conductive and dielectric fins in a coaxial waveguide
US8786380B2 (en) 2008-03-28 2014-07-22 Optim Microwave, Inc. Circular polarizer using stepped conductive and dielectric fins in an annular waveguide
US8248178B2 (en) * 2009-12-03 2012-08-21 The Aerospace Corporation High power waveguide polarizer with broad bandwidth and low loss, and methods of making and using same
US8653906B2 (en) 2011-06-01 2014-02-18 Optim Microwave, Inc. Opposed port ortho-mode transducer with ridged branch waveguide
US8994474B2 (en) 2012-04-23 2015-03-31 Optim Microwave, Inc. Ortho-mode transducer with wide bandwidth branch port
US9178261B2 (en) * 2012-07-11 2015-11-03 University Of South Florida Vertical microcoaxial interconnects
DE102015218877B4 (de) * 2015-09-30 2017-08-31 Airbus Ds Gmbh Koaxialer Diplexer und Signalkopplungseinrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE934354C (de) * 1943-12-18 1955-10-20 Funkstrahl Ges Fuer Nachrichte Anordnung zur Drehung der Phase von ultrakurzen elektromagnetischen Wellen
US3217273A (en) * 1961-12-08 1965-11-09 Siemens Ag Albis Transmit-receive polarization filter
US3668567A (en) * 1970-07-02 1972-06-06 Hughes Aircraft Co Dual mode rotary microwave coupler
US4725795A (en) * 1985-08-19 1988-02-16 Hughes Aircraft Co. Corrugated ridge waveguide phase shifting structure

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2783440A (en) * 1955-01-26 1957-02-26 Lockheed Aircraft Corp Light weight wave guide construction
US3413642A (en) * 1966-05-05 1968-11-26 Bell Telephone Labor Inc Dual mode antenna
JPS4836986Y1 (fr) * 1970-06-11 1973-11-05
JPS6030441B2 (ja) * 1977-07-04 1985-07-16 日本電気株式会社 ２周波数帯共用移相器
US4504805A (en) * 1982-06-04 1985-03-12 Andrew Corporation Multi-port combiner for multi-frequency microwave signals
JPS5977702A (ja) * 1982-10-26 1984-05-04 Nec Corp 導波管型移相器
DE3617560C2 (de) * 1986-05-24 1996-08-14 Schnell Maschfab Karl Maschine zum Abfüllen teigiger Medien, insbesondere von Wurstbrät

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE934354C (de) * 1943-12-18 1955-10-20 Funkstrahl Ges Fuer Nachrichte Anordnung zur Drehung der Phase von ultrakurzen elektromagnetischen Wellen
US3217273A (en) * 1961-12-08 1965-11-09 Siemens Ag Albis Transmit-receive polarization filter
US3668567A (en) * 1970-07-02 1972-06-06 Hughes Aircraft Co Dual mode rotary microwave coupler
US4725795A (en) * 1985-08-19 1988-02-16 Hughes Aircraft Co. Corrugated ridge waveguide phase shifting structure

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CONFERENCE PROCEEDINGS OF THE 8TH EUROPEAN MICROWAVE CONFERENCE, Paris, 4th-8th September 1978, pages 446-450, Microwave Exhibitions and Publishers Ltd, Sevenoaks, Kent, GB; "Metallic and goubau waveguides with eccentric circular and concentric circular-elliptic cross-sections" *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995010862A1 (fr) * 1993-10-14 1995-04-20 Deltec New Zealand Limited Dephaseur differentiel variable
US5801600A (en) * 1993-10-14 1998-09-01 Deltec New Zealand Limited Variable differential phase shifter providing phase variation of two output signals relative to one input signal
CN1051883C (zh) * 1996-11-28 2000-04-26 台扬科技股份有限公司 宽频、短长度的圆形波导移相器

Also Published As

Publication number Publication date
DE357085T1 (de) 1991-06-13
DE68917548T2 (de) 1995-01-05
IT8867787A0 (it) 1988-09-02
US4982171A (en) 1991-01-01
IT1223796B (it) 1990-09-29
DE68917548D1 (de) 1994-09-22
JPH02113601A (ja) 1990-04-25
EP0357085B1 (fr) 1994-08-17
AU620637B2 (en) 1992-02-20
AU4003189A (en) 1990-03-08
CA1318370C (fr) 1993-05-25

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